此方法精准好用
 
echo "$(ping ${HOSTNAME} -c 1 | grep -o -E [0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+ | head -n 1)"
 
 

据说，关闭NetworkManager服务可以禁用接口自动获取IP地址。未验证！
 
但是，既然NetworkManager服务和接口自动获取IP地址有关系，那么使用nmcli命令应该也可以达到相同的效果。
 
通过nmcli conn modify $CC ipv4.method disabled 可以禁用IPv4，自然就不会自动获取ipv4了；
 
也可通过nmcli conn modify $CC ipv4.method manual ，改成手动配置IP地址，这里需要同时设置IP地址，否则报错。
 
ipv4.method取值：[auto, link-local, manual, shared, disabled]
 
IFS_OLD=$IFS ;
IFS=$'\n';
for conn in $(nmcli c show |grep Wired|cut -b 1-19);
do 
CC="$(echo $conn |awk '{gsub(/^\s+|\s+$/, "");print}')"; 
nmcli conn modify $CC ipv4.method disabled && nmcli conn up $CC && nmcli c show $CC |grep 'ipv4.method';
done;
IFS=$IFS_OLD
 
 
 
并没有找到更好的方法，禁用dhcp自动获取IP地址，谁有更好的方式，请给我评论留言，多谢！

我们有时候会遇到服务器无法上网，这时候我们可以看下服务器的IP地址和DNS地址是否设置为自动获取
 
无法上网的截图
 
 
按照以下步骤设置服务器自动获取IP地址和DNS地址
 
 
 
 
 

</pre><pre name="code" class="csharp">1.添加引用"system.Management"
2.添加using System.Management
</pre><pre name="code" class="csharp">using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Management;

namespace IPChange
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        static void SetNetworkAdapter()
        {
            ManagementBaseObject inPar = null;
            ManagementBaseObject outPar = null;
            ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc = mc.GetInstances();
            foreach (ManagementObject mo in moc)
            {
                if (!(bool)mo["IPEnabled"])
                    continue;
                inPar = mo.GetMethodParameters("EnableStatic");
                inPar["IPAddress"] = new string[] { "172.17.123.154"};
                inPar["SubnetMask"] = new string[] { "255.255.255.0"};
                outPar = mo.InvokeMethod("EnableStatic", inPar, null);
                inPar = mo.GetMethodParameters("SetGateways");
                inPar["DefaultIPGateway"] = new string[] { "172.17.123.254"};
                outPar = mo.InvokeMethod("SetGateways", inPar, null);
                inPar = mo.GetMethodParameters("SetDNSServerSearchOrder");
                inPar["DNSServerSearchOrder"] = new string[] { "211.137.241.34", "202.97.224.69" }; 
                outPar = mo.InvokeMethod("SetDNSServerSearchOrder", inPar, null);
                break;
            }
        }


        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            SetNetworkAdapter();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc = mc.GetInstances();
            foreach (ManagementObject mo in moc)
            {
                if (!(bool)mo["IPEnabled"]) continue;
                mo.InvokeMethod("SetDNSServerSearchOrder", null);
                mo.InvokeMethod("EnableStatic", null);
                mo.InvokeMethod("SetGateways", null);
                mo.InvokeMethod("EnableDHCP", null);
                break;
            }
        }
    }
}